4.6 Article

Surface-confinement assisted synthesis of nitrogen-rich single atom Fe-N/C electrocatalyst with dual nitrogen sources for enhanced oxygen reduction reaction

期刊

NANOTECHNOLOGY
卷 32, 期 30, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abf8db

关键词

single-atom Fe-N/C electrocatalyst; binary nitrogen sources; surface-confined pyrolysis; ORR; primary Zn-air battery

资金

  1. Natural Science Foundations of Fujian Province [2018J01023]
  2. STS project of Fujian Province [2018T3024]
  3. National Nature Science Foundation of China [21771184]

向作者/读者索取更多资源

In this study, a nanoporous nitrogen-rich single atom Fe-N/C electrocatalyst was successfully prepared, showing excellent performance in the oxygen reduction reaction and outperforming commercial Pt/C catalyst, indicating great potential for application in metal-air batteries.
The utilization of earth abundant iron and nitrogen doped carbon as a precious-metal-free electrocatalyst for oxygen reduction reaction (ORR) significantly depends on the rational design and construction of desired Fe-N-x moieties on carbon substrates, which however remains an enormous challenge. Herein a typical nanoporous nitrogen-rich single atom Fe-N/C electrocatalyst on carbon nanotube (NR-CNT@FeN-PC) was successfully prepared by using CNT as carbon substrate, polyaniline (PANI) and dicyandiamine (DCD) as binary nitrogen sources and silica-confinement-assisted pyrolysis, which not only facilitate rich N-doping for the inhibition of the Fe agglomeration and the formation of single atom Fe-N-x sites in carbon matrix, but also generate more micropores for enlarging BET specific surface area (up to 1500 m(2).g(-1)). Benefiting from the advanced composition, nanoporous structure and surface hydrophilicity to guarantee the sufficient accessible active sites for ORR, the NR-CNT@FeN-PC catalyst under optimized conditions delivers prominent ORR performance with a half-wave potential (0.88 V versus RHE) surpass commercial Pt/C catalyst by 20 mV in alkaline electrolyte. When assembled in a home-made Zn-air battery device as cathodic catalyst, it achieved a maximum output power density of 246 mW.cm(-2) and a specific capacity of 719 mA.h.g(Zn)(-1) outperformed commercial Pt/C catalyst, holding encouraging promise for the application in metal-air batteries.

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